Improvement in cut-off valves



r. MEYER.-

CUT-OFF VALVE.

Patented may16,1878.

Mfieesses UNITE STATES PATENT OFFICE.

GEORGE MEYER, OF NEW YORK, N. Y., ASSIGNOR OF ONE-HALF H[S RIGHT TO oORNELIUs ELAMATER AND GEORGE E. RORINsON, on SAME PLACE.

IMPROVEMENT IN CUT-OFF VALVES.

. Specification forming part of Letters Patent No.177,536, dated May 16, 1876 application filed March 16, 1876.

To all whom it may concern:

Be it known that I, GEORGE F. MEYER, of

the city, county, and State of New York,'have invented a new and 'useful Improvement in Valves for Rock-Drills and other direct-acting engines; and I do hereby declare that the following is a full, clear, and exactdescription of the same, reference being bad to the accompanying drawing, which forms part of this specification. I

This invention is more particularly designed to be applied to rock-drills, and will here be described accordingly. It is, however, equally applicable to other direct-acting engines, in which it is not necessary, or at least always so, to have the propelling-fluid act withlthe same freedom or force on the piston when moving in the one direction as when moving in the other, and in which it is desirable to vary or increase or diminish the supply of propellingfluid at the one end of the cylinder as compared with the supply at the other end thereof. The invention relates to means for controlling the admission of the-propelling-fluid eduction' to and from one end of the cylinder,

and which is controlled by the hand plug or valve, and a separate eductiOn-passage for the same end of the cylinder, both of which passages are governed by the main valve. combination and construction of parts provide for the. most perfect regulation as regards the supply of the steam or propellingfluid to the end of the cylinder so controlled,

with an enlarged or extra freedom of exhaust therefrom, in a simple, compact, and most durable manner. Ordinarily it will not be re- Such quired to have more than one of such induction-controlling valves for varying the ingress of propelling-fluid at the one end of the cylinder only. Thus, in the application of the invention to a rock drill, to be worked, say, by steam, although no restriction is placed upon the kind of propelling agent or fluid, it will only be necessary to apply the adjustable induction-controlling valve to regulate the induction of steam to the drill-bar end of the cylinder-that is, to that side of the'piston on which the drill-bar is situated-to provide for varying the force of the return action of the drill, accordingly as it is being worked in an upward, downward, or any intermediate position, or as other circumstances or conditions may require. Such induction-controllin g valve is made adjustable by hand.

In the accompanying drawing, Figures 1 and 2 represent transverse sections of a valve-box and valves in accordance vith my invention, and designed to be applied to a rock-drill, said sections being taken in planes .parallel with each other-that is, the section in Fig. 1, on the line 1; c in Fig. 3, looking in direction of the arrows a a, and the section in Fig. 2 on the line to w, looking in direction of the arrows b b. Fig. 3 is an irregular section on the line a: w in Fig. 1. Fig. 4 is a section on the line y y in'Fig. 2, looking in direction of the arrow 0.

A is the valve-box, to which steam is admitted, as by an opening, 01, or otherwise. B is the main valve, which is here represented as circular, and which has a curvilinear reciprocating motion about its axis by means of a tappet, s, or otherwise. Said valve has an exhaust-cavity, c, in it, which is always in communication, during the rolling ,gfuthe-valve, with the exhaust-outlet Z. 'It is furthermore provided on its one side with an inductionpassage, f, extending throughout the length of the valve, or thereabout, and serving,wheu the valve is in the position represented in Figs. 1 and 2, to pass steam from the valve-box, through a-fixed induction-passage, g, to and through a fixed induction and eduction passage, h, which passes the steam to the back of the piston-that is, the side of the piston on nects.

the drill-bar works, is ditferently controlled.

Thus, the valve B has its induction-passagef.

wholly near the one end of the valve, or extending only throughout a portion of itslength, and the fixed induction-passage 9 extends in like manner only partially along the valvebox, in like transverse relation with the valve, as the induction-passage f. The fixed passage h, on the same side-of the main valve as .the

fixed passage g, is separated, at or near its;

outer end, by a partition, 6, arranged intermediately of the width of the valve-box, therebyv forming two branches or passages,.h h both of which are in communication withthe-Seat of the main valve. an eduction-passage, and is arranged beyond or to one side of the induction-passage]? of. the Such passage h 'constitutesnanc independent or additional eduction port or way, and is sufliciently large to give a free, exhaust. The passage h is .both for induction main valve.

and eduction to and from the same end of the cylinder as that with which the passageh con- This passage h is on thesame side-of the valve-box as the fixed passage 9. and the passage f of the valve. The exhaust-cavity 0 extends throughout the length of thevalve,

B, or thereabout, so that it communicates with both passages h h. 0 is the induction-com trolling valve applied to the passage h, and. on the same side of the main valve and valve- The passage h? is purely box' as are the passages f g. This contrd lingvalve is represented as a simple plug formed with a longitudinal cavity, k, in it, and is adjustable by hand from the exterior of the valve-box.

Unlike the main valve 13, theinduction-controlling valve 0 does not have a constant motion, but isonly set from time to-time according to the amount of steam it is desired to supply to the engine by the passage h Thus it maybe turned or set so that its cavityk will establish full or free communication through the passage h for the steam to the drill side of the piston, when the main valve isturned sothat its passage f connects the passages g and h}, or said induction-controlling valve 0 may be set to more or less contract the passage h by the cavity 70 in the ;valve. This mode-of, controlling the ingress iOf steamvto the" one end of the cylinder: does .not cripple or interfere with. the-exhaust 'from' such; end, butv the passageh which is-both; for inductionand eduction, gives an enlarged or extra freedom to the exhaust, through the valve C, over: and: above the capacity ofithe exclusively exhaust-passage h I claim- The combination,with the rolling'main valve the, valve box 013303186 controlled by the hand valve (1,-andalsobythemainrvalve B, thesep arateeductionrpassage h controlled by themainvalve, and thepassages h h, substantially as and for; the purpose or purposes set forth...

GEORGE F. MEYER.

Witnesses:

BENJAMIN W. HOFFMAN, FBEuHAYNEs. 

